At Frankfurt GM's Opel unit showed a small diesel-electric hybrid with a battery that can be recharged from the mains to give an electric-only range of 40 miles.
The unit is not disconnected from the AC power source (mains) as long as it is connected to the wall outlet, even if the unit itself has been turned off.
只要是电源线仍接插在墙上电源插座，即使关掉机器上的电源开关，但机器仍并没有完全断开AC主电源。
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Pressing this button will also illuminate the display screen for 10 seconds if power unit is in battery operation (screen will always be illuminated in mains operation).